Backup Exec 2014 - Netapp

I have a Media center on Windows 2008 R2 Datacenter.

Backup Exece 2014.

We have 2 jobs for 2 differetnt Netapp.

One of these work fine , while the other one fail with this error

Final error: 0xe000fefd - The Backup Exec server has lost the network connection to the Agent for Windows.
Final error category: Other Errors

For additional information regarding this error refer to link V-79-57344-65277

I try to follow the instruction in the symantec kb but the problem persists